Carregation

Carregation is the unexplained process for land animals which, over thousands of years, evolve to live in life under the surface of the Blue Sea.

Carregation has only effected mammalians and birds. Fish and reptiles, other than adjusting to the other properties of the Blue Sea, are largely unaffected by the godswater.

Skeletal/Muscular
The Carregation process changed the composition of bones, making them extremely dense and heavy. The average Nautix, who is an average of 10 cm shorter than an Eyrsan, will weigh almost 250kg (roughly 3x heavier) outside of the water. This weight is matched by a muscular system which is used to propel their bodies through the water.

Nautix and other Carreg animals move on the relatively thin waters of the Blue Sea floor almost as freely as their land dwelling counterparts.

Because of the density of the bone and its strength, both Nautix and Eyrsan people harvest animal bones, or "carreg" for tools and weapons.

Respiration
Carregated animals breathe freely under the Blue Sea thanks to an evolution of the traditional voicebox into a natural filtration organ. The "carregated gill" processes godswater (aka Azure) and separates out oxygen for the animals to breathe. Thanks to this evolution, though, Carregated animals are incapable of producsing pneumatic sounds, including the Nautix, who are completely mute.

Skin/Hide
The skin of a Carregated animal is typically smooth and hairless. Nautix have kept hair on their heads, but researchers think this is because of sexual selection during their evolution (hair was most likely preferred by their ancient human ancestors, so this trait likely remained relevant after during the evolution).

Hides are mostly uselss above land, as they decompose quickly in the dry air, though Nautix tribes do use animal hides in similar ways to humans on land.

Communication
Carregated animals are incapable of producing sounds from their throats like their ancestors. This is due to the "carregated gill" which allows them to breathe godswater. Nautix have overcome this by developing an intricate sign language system alongside a very extensive and complex writing system.

Misc.
Carreg animals can breathe air freely, but their outer skin is badly damaged by prolonged exposure to the air. Nautix will often

The exception to this trait is the Scalehawk, which can fly in the air for hours without issue. This is because their hunting patterns require that they fly in the air and come down quickly on unsuspecting fish.